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4PATEN- G. H. REYNOLDS.

MGUNIING LITHOGRAPHIG STGNBS. z

UNITED sTATns TATENT OFFICE.

GEORGE H. REYNOLDS, 0F NEW YORK, N. Y.

MOUNTING LITI-IOGRAPHIC STONES.

Specification of Letters Patent No. 31,033, dated January 1 1861.

To all whom it may concern:

Be it known that I, GEORGE I-I. REYNOLDS, of New York, in the county and State of New York, have invented a certain new and useful Improvement in the Art Of Lithographing;

and I do hereby declare that the following is a full, clear, and exact description of the same, reference being made to the annexed drawing, making a part of this specification, which is fully described herein-that is to say:

My invention relates to a method 'of so mounting the stone that it is thereby more readily placed and replaced upon the bed Of the press, is rendered less liable to be broken by the pressure of the roller while printing, and may also be worn down much thinner than has hitherto been found practicable.

Lithographie stones have ordinarily been placed for printing directly upon t-he bed of the press, the face of the stone being made parallel to the surface of the bed, only by repeated trials. The stone has sometimes beenv cemented to the bed by plaster of paris, Or other suitable cement, and then the difficulty Of making the face parallel with the surface of the bed is still further increased, while if as sometimes happens, the stone should require to be removed for retouching the drawing, the labor of replacing it must all be gone over again. The stone used for lithographing is necessarily of a soft character, and hence it is requisite that the blocks used should be thick enough to prevent them from being broken under the pressure Of the printing roller, and this thickness must be proportioned to t-he area of the face Of the stone.

All of these difficulties are Obviated by my improvement, which consists in cementing each stone permanently in a movable frame Or bed of cast iron or other suitable metal, the underside of which has first been planed flat, and then grinding the face of the stone parallel with said underside of the iron bed.

This movable frame is to be made of such regular form that it may readily be secured to the bed Of the press by screw clamps, Orl

otherwise, as desired.

In the annexed drawing a stone with its iron frame is shown as thus secured tO the bed of the press, a portion being represented in section, tO exhibit construction. The lithographie stone is seen at (a), the iron frame at (b), and the bed of the press at (c). The sides of t-he recess in the iron should properly be cut under a little, and the lower part of the edge of the stone be left rough in Order that the cement employed may more certainly remain in place. A cement which I have found suitable is sulfur, and if the iron be first made hot the melted sulfur may be poured into the recess and then the stone deposited in place, taking care that the cement fills all space between the stone and the iron. The face of the stone is then to be dressed Off parallel with the underside Of its iron frame and it is ready for use.

For a stone of say thirty inches square, the usual thickness considered necessary would be about six inches, and even of this thickness they are sometimes broken while printing. Such a stone I am enabled to saw into three or more slabs, each Of suliicient thickness, when mounted according to my herein described method, to be employed under any pressure required, with perfect safety, and they may be so employed until worn quite down, since there 1s no yielding under any part to cause a fracture.

I claim- Mounting each stone permanently in a metallic frame, in the manner and for the purposes substantially as set forth.

. eno. H. REYNOLDS.

Writnesses 1 I. P. PIRSSON, S. I-I. MAYNARD. 

